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FLYLAND is an MCEdit filter for making floating islands from your selection box.

To use it, select a square-ish region of land from the surface of your map. Then re-size the selection box so that the depth below the surface is the amount of material you want under the island and the top of the selection box is at the height you want to see the top of the island. Press filter.

HOW IT WORKS

1. The top of the island is found by looking for the highest non-air block. This could be a tree, or a tower apex, for instance

2. The most probable surface of the island is found by counting the number of non-air blocks in each layer. This may be the surface of plains, or the first complete layer of soil or stone in a slope

3. The depth of the island is found at each point by calculating a sinusoidal depth at that point based on the ratio of the radius at that point to the total width of the island out from the centre in the direction of that point.

4. All of the blocks that fall within the copy region are shifted upward by the amount defined by the distance from the top of the selection box to the highest block found in step (1).

One thing would make this better: If instead of a 'cone' style below the island, if it used some like random noise of sorts to make peeks and jagged bits, below.http://i.imgur.com/9eryF.jpg?1Something kinda like that.

Thanks - I have been told this a lot so I will give it some thought. There are some alternate base types commented out on the script that can be uncommented for different effects. The 'falling sand' base isn't currently one of them though.